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Echinasteridae
The Echinasteridae are a family of starfish in the monotypic order Spinulosida. The family includes eight genera and about 133 species found on the seabed in various habitats around the world. Taxonomy Echinasteridae contains eight genera and about 133 species. The two genera '' Echinaster'' and ''Henricia'' are the most speciose, forming species complexes. ''Echinaster'' has a largely tropical distribution and occurs in shallow seas including continental shelves, while ''Henricia'' is cosmopolitan, occurring mostly in cold waters, including polar habitats and abyssal locations. '' Aleutihenricia'' and '' Odontohenricia'' are native to the northeastern Pacific Ocean, in the vicinity of the Aleutian Islands. Characteristics Echinasterids are mostly five-armed starfish with thick but small discs, and long, slender, often cylindrical arms. The cuticle is covered on both the aboral (upper) and oral (lower) surfaces by a latticework of ossicles which are either flattened or rounded ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echinaster
''Echinaster'' is a well-studied and common genus of starfish containing ~30 species and is the second-largest genus found within the family Echinasteridae. The genera ''Henricia'' and ''Echinaster'' encompass 90% of all the species found within the family Echinasteridae. It contains 30 species, however the number of species in this genus is still debatable because of uncertainty within the genera. This genus is currently sub-divided into two sub-genera: ''Echinaster'' and ''Othilia'', evolutionary relationships between the sub-genera is not understood. ''Echinaster'' are found in the Pacific, Atlantic and Indian oceans, with most species being studied in the Gulf of Mexico and Brazil. The sub-genera ''Othilia'' is thought to encompass species mainly found in the Gulf of Mexico and Brazil. ''Echinaster'' is often one of the most studied species within the family Echinasteridae and is often used to find evolutionary relationships. Many species found within ''Echinaster'' are red, o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dictyaster
''Dictyaster'' is a small genus of starfish in the family Echinasteridae in the order Spinulosida. Species The following two species are recognised by the World Register of Marine Species: *'' Dictyaster xenophilus'' Wood-Mason & Alcock, 1891 *'' Dictyaster wood-masoni'' Alcock, 1893 (nomen nudum In taxonomy, a ''nomen nudum'' ('naked name'; plural ''nomina nuda'') is a designation which looks exactly like a scientific name of an organism, and may have originally been intended to be one, but it has not been published with an adequate descr ..., Undescribed) References Echinasteridae {{Asteroidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aleutihenricia
''Aleutihenricia'' is a genus of starfish in the family Echinasteridae in the order Spinulosida. Species The following species are recognised by the World Register of Marine Species The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive list of names of marine organisms. Content The content of the registry is edited and maintained by scientific specialist ...: *'' Aleutihenricia beringiana'' (Djakonov, 1950) *'' Aleutihenricia derjungini'' (Djakonov, 1950) *'' Aleutihenricia federi'' Clark & Jewett, 2010 *'' Aleutihenricia reticulata'' (Hayashi, 1940) References Echinasteridae {{Asteroidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Odontohenricia
''Odontohenricia'' is a genus of starfish in the family Echinasteridae in the order Spinulosida The Spinulosida are an order of sea stars containing at least 120 species in seven genera and one family. Spinulosids completely lack pedicellariae and have a delicate skeletal arrangement. Their name comes from the presence of numerous low spi .... Species The following species are recognised:- *'' Odontohenricia ahearnae'' Clark & Jewett, 2010 *'' Odontohenricia anarea'' O'Hara, 1998 *'' Odontohenricia aurantia'' Clark & Jewett, 2010 *'' Odontohenricia clarkae'' Rowe & Albertson, 1988 *'' Odontohenricia endeavouri'' Rowe & Albertson, 1988 *'' Odontohenricia fisheri'' Rowe & Albertson, 1988 *'' Odontohenricia hayashii'' Rowe & Albertson, 1988 *'' Odontohenricia violacea'' Clark & Jewett, 2010 References Echinasteridae {{Asteroidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henricia Sexradiata
''Henricia sexradiata'' is a species of starfish in the family Echinasteridae. It is native to the western Atlantic Ocean and the Gulf of Mexico. Distribution and habitat ''Henricia sexradiata'' is found in the tropical and semi-tropical western Atlantic Ocean. Its range extends from South Carolina to Jamaica, the Gulf of Mexico and Nicaragua. It is found on sandy and shelly bottoms at depths between . Ecology ''Henricia sexradiata'' can undergo a form of asexual reproduction Asexual reproduction is a type of reproduction that does not involve the fusion of gametes or change in the number of chromosomes. The offspring that arise by asexual reproduction from either unicellular or multicellular organisms inherit the fu ... by undergoing fission, with part of the disc and one or more arms breaking off; the missing parts of each section then regenerate to form two new individuals. References Echinasteridae Starfish described in 1881 {{asteroidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henricia
''Henricia'' is a large genus of slender-armed sea stars belonging to the family Echinasteridae. It contains about fifty species. The sea stars from this genus are ciliary suspension-feeders, filtering phytoplankton. Species According to the World Register of Marine Species (WoRMS), the following species belong to this genus Gallery Henricialeviuscula.jpg, ''Henricia leviuscula ''Henricia leviuscula'', commonly called the Pacific blood star, it is a species of sea star found along the Pacific coast of North America. Description They can usually be identified by their bright orange-red color, but there can also be man ...'' Starfish at Castle Rocks P7260899.JPG, '' Henricia ornata'' References Further reading * Catalogue of Life. (2008). Catalogue of Life. (2008). Retrieved May 8, 2010, from Species 2000: http://www.catalogueoflife.org/annual-checklist/2008/browse_taxa.php?selected_taxon=991569 * Clark, A.M. & Downey, M.E. (1992) Starfishes of the Atlantic. Chapman & ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spinulosida
The Spinulosida are an order of sea stars containing at least 120 species in seven genera and one family. Spinulosids completely lack pedicellariae and have a delicate skeletal arrangement. Their name comes from the presence of numerous low spines on the aboral (upper) surface. No fossil spinulosids have yet been found. Taxonomy The following family is recognised by the World Register of Marine Species: * Echinasteridae The Echinasteridae are a family of starfish in the monotypic order Spinulosida. The family includes eight genera and about 133 species found on the seabed in various habitats around the world. Taxonomy Echinasteridae contains eight genera and ... Verrill, 1870 References Echinoderm orders {{Asteroidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echinaster Luzonicus
''Echinaster luzonicus'', the Luzon sea star, is a species of starfish in the family Echinasteridae, found in shallow parts of the western Indo-Pacific region. It sometimes lives symbiotically with a copepod or a comb jelly, and is prone to shed its arms, which then regenerate into new individuals. Description ''Echinaster luzonicus'' is normally a six-armed starfish but is often rather asymmetrical in appearance because of its habit of shedding arms. It is somewhat variable in colouring, ranging from red to dark brown. Both these colour morphs were collected off Heron Island in the Great Barrier Reef, and individuals seemed able to change their colour from red to brown and back again, possibly as a response to the amount of ambient light they received. Distribution and habitat ''Echinaster luzonicus'' is found in the tropical and sub-tropical western Indo-Pacific region. Its range extending from Madagascar and the east coast of Africa to Northern Australia, Indonesia and the P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Filter Feeder
Filter feeders are a sub-group of suspension feeding animals that feed by straining suspended matter and food particles from water, typically by passing the water over a specialized filtering structure. Some animals that use this method of feeding are clams, krill, sponges, baleen whales, and many fish (including some sharks). Some birds, such as flamingos and certain species of duck, are also filter feeders. Filter feeders can play an important role in clarifying water, and are therefore considered ecosystem engineers. They are also important in bioaccumulation and, as a result, as indicator organisms. Fish Most forage fish are filter feeders. For example, the Atlantic menhaden, a type of herring, lives on plankton caught in midwater. Adult menhaden can filter up to four gallons of water a minute and play an important role in clarifying ocean water. They are also a natural check to the deadly red tide. Extensive article on the role of menhaden in the ecosystem and possible resul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cilium
The cilium, plural cilia (), is a membrane-bound organelle found on most types of eukaryotic cell, and certain microorganisms known as ciliates. Cilia are absent in bacteria and archaea. The cilium has the shape of a slender threadlike projection that extends from the surface of the much larger cell body. Eukaryotic flagella found on sperm cells and many protozoans have a similar structure to motile cilia that enables swimming through liquids; they are longer than cilia and have a different undulating motion. There are two major classes of cilia: ''motile'' and ''non-motile'' cilia, each with a subtype, giving four types in all. A cell will typically have one primary cilium or many motile cilia. The structure of the cilium core called the axoneme determines the cilium class. Most motile cilia have a central pair of single microtubules surrounded by nine pairs of double microtubules called a 9+2 axoneme. Most non-motile cilia have a 9+0 axoneme that lacks the central pair o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zooplankton
Zooplankton are the animal component of the planktonic community ("zoo" comes from the Greek word for ''animal''). Plankton are aquatic organisms that are unable to swim effectively against currents, and consequently drift or are carried along by currents in the ocean, or by currents in seas, lakes or rivers. Zooplankton can be contrasted with phytoplankton, which are the plant component of the plankton community ("phyto" comes from the Greek word for ''plant''). Zooplankton are heterotrophic (other-feeding), whereas phytoplankton are autotrophic (self-feeding). This means zooplankton cannot manufacture their own food but must eat other plants or animals instead — in particular they eat phytoplankton. Zooplankton are generally larger than phytoplankton, most are microscopic, but some (such as jellyfish) are macroscopic and can be seen with the naked eye. Many protozoans (single-celled protists that prey on other microscopic life) are zooplankton, including zooflagellates, fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scavenger
Scavengers are animals that consume dead organisms that have died from causes other than predation or have been killed by other predators. While scavenging generally refers to carnivores feeding on carrion, it is also a herbivorous feeding behavior. Scavengers play an important role in the ecosystem by consuming dead animal and plant material. ''Decomposers'' and detritivores complete this process, by consuming the remains left by scavengers. Scavengers aid in overcoming fluctuations of food resources in the environment. The process and rate of scavenging is affected by both biotic and abiotic factors, such as carcass size, habitat, temperature, and seasons. Etymology Scavenger is an alteration of ''scavager,'' from Middle English ''skawager'' meaning "customs collector", from ''skawage'' meaning "customs", from Old North French ''escauwage'' meaning "inspection", from ''schauwer'' meaning "to inspect", of Germanic origin; akin to Old English ''scēawian'' and German ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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